package com.ruoyi.framework.web.service;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;

import com.ruoyi.common.core.domain.entity.SysUser;
import com.ruoyi.common.exception.UserLockedException;
import com.ruoyi.common.utils.ImageVerificationCode;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.BadCredentialsException;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.crypto.bcrypt.BCrypt;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.stereotype.Component;
import com.ruoyi.common.constant.CacheConstants;
import com.ruoyi.common.constant.Constants;
import com.ruoyi.common.constant.UserConstants;
import com.ruoyi.common.core.domain.model.LoginUser;
import com.ruoyi.common.core.redis.RedisCache;
import com.ruoyi.common.exception.ServiceException;
import com.ruoyi.common.exception.user.BlackListException;
import com.ruoyi.common.exception.user.CaptchaException;
import com.ruoyi.common.exception.user.CaptchaExpireException;
import com.ruoyi.common.exception.user.UserNotExistsException;
import com.ruoyi.common.exception.user.UserPasswordNotMatchException;
import com.ruoyi.common.utils.DateUtils;
import com.ruoyi.common.utils.MessageUtils;
import com.ruoyi.common.utils.StringUtils;
import com.ruoyi.common.utils.ip.IpUtils;
import com.ruoyi.framework.manager.AsyncManager;
import com.ruoyi.framework.manager.factory.AsyncFactory;
import com.ruoyi.framework.security.context.AuthenticationContextHolder;
import com.ruoyi.system.service.ISysConfigService;
import com.ruoyi.system.service.ISysUserService;

import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.concurrent.TimeUnit;

/**
 * 登录校验方法
 * 
 * @author ruoyi
 */
@Component
public class SysLoginService
{
    @Autowired
    private TokenService tokenService;

    @Resource
    private AuthenticationManager authenticationManager;

    @Autowired
    private RedisCache redisCache;
    
    @Autowired
    private ISysUserService userService;

    @Autowired
    private ISysConfigService configService;

    @Autowired
    private BCryptPasswordEncoder bCryptPasswordEncoder;

    @Autowired
    private HttpServletRequest request;


    /**
     * 获取图片验证码
     */
    public void getImageCode(OutputStream outputStream) {
        ImageVerificationCode imageVerificationCode = new ImageVerificationCode();
        BufferedImage image = imageVerificationCode.getImage();
        String text = imageVerificationCode.getText();
        redisCache.redisTemplate.opsForValue().set(text, request.getRemoteAddr(), 1, TimeUnit.MINUTES);
        try {
            ImageVerificationCode.output(image,outputStream);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }


    /**
     * 登录验证
     * 
     * @param username 用户名
     * @param password 密码
     * @param code 验证码
     * @param uuid 唯一标识
     * @return 结果
     */
    public String login(String username, String password, String code, String uuid)
    {
        // 验证码校验
        validateCaptcha(username, code, uuid);
        // 登录前置校验
        loginPreCheck(username, password);

        //判断用户是否锁定
        String loginLock = CacheConstants.LOGIN_LOCK_KEY + username;
        if (redisCache.hasKey(loginLock)){
            //若被锁定，获取剩余锁定的时间
            long expireTime = redisCache.getExpire(loginLock);

            AsyncManager.me().execute(AsyncFactory.recordLogininfor(
                    username,Constants.LOGIN_FAIL,
                    MessageUtils.message("user.login.locked", expireTime)
            ));
            try {
                throw new UserLockedException(400,MessageUtils.message("user.login.locked", expireTime));
            } catch (UserLockedException e) {
                throw new UserLockedException(e.getCode(),e.getMessage());
            }
        }

        // 用户验证
        Authentication authentication = null;
        try
        {
            UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(username, password);

            //通过用户名获取用户信息
            SysUser sysUser = userService.selectUserByUserName(username);
            String userName = sysUser.getUserName();
            if (null == userName){
                AsyncManager.me().execute(AsyncFactory.recordLogininfor(username,Constants.LOGIN_FAIL,
                        MessageUtils.message("user.no.exists")));
                throw new UserNotExistsException();
            }

            //获取用户密码
            //1.非空
            String sysUserPassword = sysUser.getPassword();
            //加密
            boolean matches = bCryptPasswordEncoder.matches(password, sysUserPassword);
            if (!matches){
                AsyncManager.me().execute(AsyncFactory.recordLogininfor(password,Constants.LOGIN_FAIL,
                        MessageUtils.message("password.error")));
            }

            AuthenticationContextHolder.setContext(authenticationToken);
            // 该方法会去调用UserDetailsServiceImpl.loadUserByUsername
            authentication = authenticationManager.authenticate(authenticationToken);
        }
        catch (Exception e)
        {
            if (e instanceof BadCredentialsException)
            {
                //密码错误，累计失败次数
                String countKey = CacheConstants.LOGIN_FAIL_COUNT_KEY + username;
                //密码错误，次数加一
                Long increment = redisCache.redisTemplate.opsForValue().increment(countKey, 1);
                //设置过期时间
                if (null != increment && increment == 1){
                    redisCache.expire(countKey, 24, TimeUnit.HOURS);
                }

                //判断是否达到锁定的阀值
                if (increment != null && increment >= CacheConstants.MAX_FAIL_COUNT){
                    redisCache.setCacheObject(loginLock,"1",CacheConstants.LOCK_TIME, TimeUnit.SECONDS);
                    //记录锁定日期
                    AsyncManager.me().execute(AsyncFactory.recordLogininfor(username, Constants.LOGIN_FAIL, MessageUtils.message("user.password.not.match")));
                }
                throw new UserPasswordNotMatchException();
            }
            else
            {
                AsyncManager.me().execute(AsyncFactory.recordLogininfor(username, Constants.LOGIN_FAIL, e.getMessage()));
                throw new ServiceException(e.getMessage());
            }
        }
        finally
        {
            AuthenticationContextHolder.clearContext();
        }

        String failCountKey = CacheConstants.LOGIN_FAIL_COUNT_KEY + username;
        redisCache.deleteObject(failCountKey);

        AsyncManager.me().execute(AsyncFactory.recordLogininfor(username, Constants.LOGIN_SUCCESS, MessageUtils.message("user.login.success")));
        LoginUser loginUser = (LoginUser) authentication.getPrincipal();
        recordLoginInfo(loginUser.getUserId());
        // 生成token
        return tokenService.createToken(loginUser);
    }

    /**
     * 校验验证码
     * 
     * @param username 用户名
     * @param code 验证码
     * @param uuid 唯一标识
     * @return 结果
     */
    public void validateCaptcha(String username, String code, String uuid)
    {
        boolean captchaEnabled = configService.selectCaptchaEnabled();
        if (captchaEnabled)
        {
            String verifyKey = CacheConstants.CAPTCHA_CODE_KEY + StringUtils.nvl(uuid, "");
            String captcha = redisCache.getCacheObject(verifyKey);
            if (captcha == null)
            {
                AsyncManager.me().execute(AsyncFactory.recordLogininfor(username, Constants.LOGIN_FAIL, MessageUtils.message("user.jcaptcha.expire")));
                throw new CaptchaExpireException();
            }
            redisCache.deleteObject(verifyKey);
            if (!code.equalsIgnoreCase(captcha))
            {
                AsyncManager.me().execute(AsyncFactory.recordLogininfor(username, Constants.LOGIN_FAIL, MessageUtils.message("user.jcaptcha.error")));
                throw new CaptchaException();
            }
        }
    }

    /**
     * 登录前置校验
     * @param username 用户名
     * @param password 用户密码
     */
    public void loginPreCheck(String username, String password)
    {
        // 用户名或密码为空 错误
        if (StringUtils.isEmpty(username) || StringUtils.isEmpty(password))
        {
            AsyncManager.me().execute(AsyncFactory.recordLogininfor(username, Constants.LOGIN_FAIL, MessageUtils.message("not.null")));
            throw new UserNotExistsException();
        }
        // 密码如果不在指定范围内 错误
        if (password.length() < UserConstants.PASSWORD_MIN_LENGTH
                || password.length() > UserConstants.PASSWORD_MAX_LENGTH)
        {
            AsyncManager.me().execute(AsyncFactory.recordLogininfor(username, Constants.LOGIN_FAIL, MessageUtils.message("user.password.not.match")));
            throw new UserPasswordNotMatchException();
        }
        // 用户名不在指定范围内 错误
        if (username.length() < UserConstants.USERNAME_MIN_LENGTH
                || username.length() > UserConstants.USERNAME_MAX_LENGTH)
        {
            AsyncManager.me().execute(AsyncFactory.recordLogininfor(username, Constants.LOGIN_FAIL, MessageUtils.message("user.password.not.match")));
            throw new UserPasswordNotMatchException();
        }
        // IP黑名单校验
        String blackStr = configService.selectConfigByKey("sys.login.blackIPList");
        if (IpUtils.isMatchedIp(blackStr, IpUtils.getIpAddr()))
        {
            AsyncManager.me().execute(AsyncFactory.recordLogininfor(username, Constants.LOGIN_FAIL, MessageUtils.message("login.blocked")));
            throw new BlackListException();
        }
    }

    /**
     * 记录登录信息
     *
     * @param userId 用户ID
     */
    public void recordLoginInfo(Long userId)
    {
        userService.updateLoginInfo(userId, IpUtils.getIpAddr(), DateUtils.getNowDate());
    }

}
